Bolt-anchor.



H.,W. PLEISTAER. BOLT ANCHOR. APPLICATION FILEDl APR. 16. 1915.

1,155,615. Patented Oct. 5, 19l5.

WIM/58858 WWE@ @Terras rafrnrrr HENRY W. PLEISTER, OF WESTFIELD, NEVI JERSEY, ASSIGNOR TO HENRY B. NEWHALL.

BOLTfANCHOR.

Specification of Letters Patent.

Original application filed January 20, 1915;. Serial No. 3,328. Divided and this application filed Apri; 1e,

T @all w hom t may concern:

Be it known that I, HENRY lV. ILnisrnii, a citizen of the United Sta-tes, and a resident ofy lVestlield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Bolt- Anchors, of which the following is a specication, taken in connection with the accompanying drawings, which form a part of the same.v i

This application is a division 'of my companion application Ser. No. 3,328 iiled J anuary 20, 1915. l

My invention relates to bolt anchors, and one iny which both the Ashieldand the bolt or screw contact directly, with the walls of the support in Vwhich they are mounted. More particularly it' relates to a one part shield which may bemanufactured and sold separately as an article of manufacture.

Previous to my invention it has been the common practice to have shields and anchors with two or more expanding members between which the bolt or screw was mounted, the diiferent members of the shield or anchor being forced apart as the bolt or i screw was inserted between them. In such bolt anchors the threads of the screw or bolt engage simply with the different members of the shield or anchor and do not engage directly with' theg'fvalls of the orifice.

In the old practice the shields are formed `of at least two members, and the anchors are provided with at least two tines or forks, it

r being understood that in the trade an anchor has' an integral head from which extends two or more tines. Ordinarily the trade use the term anchor when referring to ductile material in which the male screw threads of the expanding member will out their own cooperating female screw threads in the softer material of the anchor.

By my invention I omit entirely one of the expansible members and save .all the expense incident to its manufacture, handling and shipping. By'my-inveution the screw threads of the bolt or screw engage directly' Si rial No. 21,636.

my shield, of ductile material, if desired. in

which case the screw threads ofthe bolt or nscrew will cut their own coperating threads in the shield.

I have shown in the acconipanyingdrawings several illustrative embodiments of my invention, but of course it is to be under stood that my invention is not to be confined simply to the forms illustrated. In these drawings the same reference' numerals refer to similar parts.

Figure l is a perspective view of one form of my invention; Fig. 2 is a vertical cross section taken online 2, 2 of Fig. l; Fig. 3 isla perspective view of a modification; Fig. l is a cross section taken on line a, of Fig. 3; Fig. 5 is a perspective view of one form of my ductile shield; Fig. G is an end view on the line 6, 6 of Fig. 5; Fig.- 7 is a perspective view of my bolt anchor with a ductile shield; and Fig. 8 is a cross section substantially on the line S, S of Fig. 7.

In all forms of my invention the lag bolt or wood screw. whichever is used, contacts directly with the surface of the hole in the support and 'also with the one part substantially cylindrical shield. In this invention my shield is substantially cylindrical with an open side to permit the expanding means to contact directly with the wall of the support. The expanding member may Contact with the wall of the hole in the support sub- .stantially the entire length of the shield; or, in some cases, for less than the length of the shield. In this invention the shield may be of comparatively rigid material, as malleable iron, or it may be of 'ductile material in which the screw threads on'the lag bolt or wood screw will cut their own coperating screw threads in the ductile shield.

' In Figs. 1 and 2, I have shown a substantially cylindrical shield l having preferably external ribs 2, 2 and a bore 3, inclined with 'relation to the longitudinal axis of` the shield. In Figs. l and 2 this bore 3 is open throughout the length of the shield l. If the shield is formed of malleable iron, it is preferably, though not necessarily, made lwith interrupted screw threads 4c to cooperatc with thc male threads 5 upon the lag bolt G. These male threads 5 of the lag bolt also Contact directly with the wall of the hole in. the support (not shown) in the man* ner fully set forth in my parent application oi which this is a division.

ica

l/Vhen the cylindrical shield 1 is placed in the hole prepared for it in masonry, brick, stone, concrete, wood, terra' cotta, or any'other material, and the lag bolt 6, Jfor example, is screwed home, a most powerful gripping action is exerted by the lag bolt contacting both with the shield land the wall oi' the hole. The taper of the lag bolt alone, or with the taper of the bore 3 serves to firmly and rigidly hold the work (not shown) to the face of thesupport.

In some cases I may form my substantially Cylindrical shield 7, Figs. 3 and 4, with a partly closed inclined bore 8. In this form the bore 8 starts substantially concentric with the longitudinal axis of the shield, and then extends at an angle to said longitudinal axis emerging on the periphery or surface of the shield. This leaves a collar or closed portion 9 which may, or may not, be provided with interior screw threads. When the shield 7 is formed of rigid material as malleable iron, for example, Ipreiierably cast the screw threads 10 in the open 'portion 11-0f the* inclined bore 8 and do not provide the interior of the collar 9 with screw threads.

My bolt anchor may be made with a ductile shield 12, Fig. 5, provided with an open bore 13 inclined to the longitudnal axis of the shield the same as in Fig. 1.. In use the action is the same except that the male screw threads on the lag bolt 6 or wood screw 14 will cut their owneoperating screw threads in the shield 12.

In Figs. 7 and 8 I have shown the shield 15 of the ductile material and coperating with a wood screw 14. .The action of this bolt anchor is the sameas that illustrated iny Fig. 3 except that the wood screw 14:, or lag screw 6, if one be used, will cut its own coperating screw threads in the ductil."y shield. This shield is provided with a collarl. v f

Having thus described this invention in connection with the illustrative embodiments thereof tothe details of which I do not de-4 sire to be limited except as required by the l scope of the appended'claims, what is claimed as new and what it is desired to secure by Letters Patent is set forth in the appended claims.

Copies of this patent may be obtained foi` five leentsieach, by addressing the .t'he periphery of the shield.

Vilhat I claim as my invention and desire to secure by Letters Batent is :4

'1. A bolt anchor comprising in combination a cylindrical shield, provided with an inclined bore and an opening in its side and a bolt to engage in said bore and opening to coperate with the cylindrical shield.

2. A bolt anchor comprising in combination a cylindrical shield provided with a bore starting at one end substantially concentric with the longitudinal axis of the cylindrical shield, and then extending at an angle to said longitudinal axis of the shield and emerging on the periphery of the shield, and a bolt to engage said bore andsopening formed on the periphery of the shield.

3. An article of'manui'acture comprising a cylindrical shield having an inclined bore extending to its periphery.

Il. An article of manufacture comprising a cylindrical shield having a bore starting at one end substantially concentric with the longitudinal axis of the cylindrical shield and then extending at an angle to said lor1 gitudinal axis and emerging on the periphery of said shield.

5. A bolt anchor comprising in' combination a substantially cylindrical shield with an inclined bore provided with interrupted screw threads and a bolt or screw to cooperate with the screw threads.

6. A bolt anchor comprising in combination a siibstantially cylindrical shield with an inclined bore provided with interrupted 1 screw threads for a part of its length and a bolt or screw to coperate with the screw threads.

...h article of manufacture comprising a shield having a substantially cylindrical body and provided with an inclined bore extending to its periphery and with a collar.

8. In a bolt anchor the combination of a spbstantially cylindrical shield provided with an inclined bore extending` out to its periphery,a collar, and a bolt or screw to engage in'said bore and opening formed. on

HENRY w. Pnnis'rnn.

Witnesses Y n A. M. IVILLIAMS, M. R. RYAN.

Commissioner of Patents.'

Washington, D. C." 

